Speaker



FIG. 1 is a front perspective view of a speaker showing my new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is atop plan view thereof.

The broken lines environment is for illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 